Two series of liquid crystalline, main-chain polyesters were synthesized having mesogenic triads based on substituted hydroquinones to form the center of the triad and two residues of p-hydroxybenzoic acid at either side. The two series differed only in the nature of the spacer; in one series it was the decamethylene and in the other the tetrakis(oxyethylene) unit. Both the type of lateral substituent and the type of spacer had a profound influence on the mesogenic properties compared to that of the unsubstituted polymer. The methyl substituent increased the temperature range of the mesophase. The ethyl substituent had a similar effect for the polymer with the decamethylene spacer, but its presence led to a marked decrease in the thermotropic properties for the polymer with the poly(oxymethylene) spacer.
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